GHRS Observations of Novae in Outburst in the Magellanic Clouds

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Hst Proposal Id #3825

Scientific paper

We propose to obtain intermediate dispersion (20-30 km/sec) spectra of the nebular phase of Magellanic Cloud (primary) novae in outburst. These observations will enable us to determine accurate elemental abundances, study the dynamics of the ejected material in the nebular stage, estimate the mass and luminosity of the hot remnant star, and test models for its post-outburst evolution. Novae in the Magellanic Clouds are the objects of choice for this program because they occur with sufficient frequency (1-2 per year), are observable 12 months per year, and have known distances and low reddening, permitting both the quantitative study of nova energetics and the comparison, on an absolute basis, of different types of novae arising from different stellar populations. With the high resolution and photon counting capabilities of the GHRS, we will be able to study the detailed structure and dynamics of novae at intermediate stages of their expansion, determining abundances for key species in the ejecta, and also measure for the first time the post-outburst UV continuum of rapidly evolving hot central star.

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